If you send OSC to user 0 you will get background behavior (i.e. no command line interaction) but it will still be a value of your user.
When you send to another user (like in your case user 99) you will avoid command line interaction as well, but the manual value of that channel will then be owned by a different user.
The distinction between a manual value being owned by your or a different user is for example Sneak behavior. When you sneak without selection the console will not sneak manual values of another user.
Depending on what you want to achieve both methods can have their pros and cons.
If you send OSC to user 0 you will get background behavior (i.e. no command line interaction) but it will still be a value of your user.
When you send to another user (like in your case user 99) you will avoid command line interaction as well, but the manual value of that channel will then be owned by a different user.
The distinction between a manual value being owned by your or a different user is for example Sneak behavior. When you sneak without selection the console will not sneak manual values of another user.
Depending on what you want to achieve both methods can have their pros and cons.
